Building-block.



S. H. WIGHTMAN.

Patented Feb.8, 1910.

fly 7217 UN lll ll) SillA'fllflS ilr-ITENI OFFICE.

SHERBURNE H. WIGHTMAN, OF CLEVELAND, OHIO, ASSIGNOR 0F ONE-HALF TO HORACE C. KELLEY, OF EAST CLEVELAND, OHIO.

BUILDING-BLOCK.

Specification of Letters Patent.

Patented Feb. 8, 1910.

Application filed September 8, 1908. Serial No. 451,946.

To all whom it may concern:

lie it: known that I, SunnnunNnI-l. \Vror-rr- MAN, a citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented a certain new and useful Improvement in Building- Blocks, .of which the following is a full, clca r, and exact description, reference being had to the accompanying drawings.

This invention relates to building blocks, and it has for its object the production of ablock of that character which shall be absolutely waterproof on those parts which are exposed to the elements, which shall be capable of use in a manner to n'oduce varied architectural effects, which siall have embedded in its exposed surface waterproof plates such as tile, which may be arranged according to any desired pattern, and whlch shall have special meansfor securely anchoring said plates into the block at the rear thereof.

The above and other objects will be more fully set forth in the description of the structure shown in the accompanying drawings, in which Figure 1 is a perspective view showing one of my improved building blocks havin i one of .its faces provided with waterproof face plate, said face plates being arranged special form of plate; and Fig. 9 is a perspep tlvesview of the corner face plate shown in 1 'Bullding blocks are as, a rule, formed of monolithic concrete, the block being substantially homogeneous throughout. These blocks are not waterproof, but on the other hand, the have the capacity of absorbing considera le quantities of water so that, when they are exposed to the elements, they not only become water soaked, thus forming a cold and dam building,-but the material of which t e blocks are formed: becomes discolored so that,-in a comparatively short time, buildings formed thereof present an unattractive ap earance. These blocks have been found to e suited admirably for interior work, but for the reasons above stated, they have not proven satisfactory for outside construction.

To overcome the above stated objections, I so form the outside or exposed portions of my blocks as to render them impervious to -watcr. I accomplish this object by molding the body of the block about rearwardly 8O projectin members on terra cotta or other.

; suitably formed face plates, and by placing in the spaces between said plates :1. waterproof sheet, which may be, and at present 5 preferably will be, formed of thick paper.

in that style of architecture known as the 5 Flemish bond and having its ends provided with projections in order that the blocks may carry out the same style bond interlocked at their ends; Fig. 2 is a perspective plates and the sheet of perforated waterproof material for spacing the plates and also showing the meta] anchor bars secured to the backs of said plates by means of which the plates are securely anchored to the block; Fig. 3 is a section taken transversely I through the block on the plane 3-3 of Fig.

1; F ig. 4 is a sectional view taken through one corner of the block on a plane at right angles to the plane of Fig. 3; Fig. 5 is aview in perspective of one of the metal anchor bars; Fig. 6 1s a perspective view showing my invuitlon applied to a corner block; Fig. 7 shows a special form of face I plates to the main body view of one of the blocks showing the face i The rear sides of the face plates will preferably be rabbeted to receive the said sheet and thus form a closely fitting joint therewith. In order to securely hold the face of the block, I attach to the plates meta anchor bars which have their ends engaging with lugs extending from the rear sides of the block, the bars bein bowed outwardly so as to become thoroughl y embedded in the cementitious material forming the bod of the block. The exposed face of the blbck is therefore formed of the waterproof face plates, and the joints between said face plates are so obstructed by the water proof sheet that the 100 entire exposed face of the block is rendered waterproof.

The blocks may be formed of any desired size or shape, the invention being admirably adapted for forming blocks for corners of 105 buildings, for porch columns, for chimneys, etc. They may also be formed of the necessary length for spanning the openings formed in the walls for doors, windows, etc,

, in which case, they may be suitably rein- H forced by metal bars if found desirable, the face plates being arranged on the exposed faces of these blocks to conform to the bonding pattern employed in the blocks forming the main parts of the wall. The 81118, the

coping, caps, ete., used in the building may also be formed with waterproof face plates.

chor the plates to the block; but, in order to Taking up a more detailed description by the use of reference characters, 1 represents one of the blocks that is constructor in accordance with my invention, said block being cored out so as to form air spaces within the body thereof as man of such air spaces being employed as may e deemed desirable; Fig. 1 of the drawing showing two of such spaces that are separated by a partition 8. The face of said block that is I to be exposed in the building is composed 1 of face plates, said plates being represented by the reference characters 4 and 4, the

former of which are longer than the other face plates and are usually termed stretchers, while the face plates 4 are called headers Of course any size, shape and arrangement of face plates may be emloyed, butI have chosen to show the form 1llustrated in Fig. 1, in which these stretchers and headers are arranged in the order known as the Flemish bond. At each of the ends of the block the stretchers 4 extend beyond the adjacent headers so as to provide projecting portions 5 with spaces between the same into which corresponding projections on the next adjacent block may extend thus locking the blocks together into a solid wall. In assemblin these blocks into a wall, the end joints wi 1 be staggered so that the partitions 3 between t e air spaces will not lie in the same plane, but will be substantially between the end joints of the adjacent tiers of blocks. It is desirable to have as free circulation of air within the walls of the building as is practicable, and, for this reason, the ends of the partition 3 are scalloped or notched at 6 thus leavin air spaces throughout the wall of the building. For the purpose of more thoroughly bonding the tiers of the blocks together and thus strengthening the walls, the sides of the blocks that are to abut in the wall are provided with grooves 7, the grooves in one block registering with the grooves in the adjacent tiers of blocks so as to form a channel between the blocks, into which the mortar that is placed between the dove-tailed, as shown, so as to be wider at their outer parts than they are adjacent the main body of the plate. WVhile the drawings show these ribs as extending entirely across the plate, they may be made shorter if preferred. The dove-tail shape given to these ribs is ordinarily sufficient to securely anavoid any possibility of the plates breaking loose from the blocks, I prefer to anchor the same by means of metallic anchor-bars 9 and 9, one of which is shown in detail in Fig. 4, the bars 9 being employed on the stretcher plates and the bars 9 on the header plates. These bars are curved, as shown, so as to cause the same to project some distance from the rear faces of the face plates and be come deeply embedded in the eementitious 1 material forming the main body of the block.

blocks in the building Wlll extend so as to The anchor bars are preferably round in section with their ends flattened at 10, which ends are adapted to be projected beneath the dove-tailed sides of the lugs 8. By flattening the bars in this manner the are not so liable to turn on the blocks. '1 e bars may be squared, or flattened throughout, if desired. As shown in Fig. 2, the edges of the ribs 8 are preferably rovided with semicircular notches -11 wit which the bars engage above their flattened portions, and the plates are also preferably recessed at 12 so that the ends of the bars may become more deeply and firmly anchored or attached to the p ates. If desired, the ribs may be omitted and the ends of the bars cemented in the recesses in'the rear faces of the plates.

As is well known, concrete or cement is much stronger in compression than it is in shear or tension. Owing to its comparative weakness in shear, the cement of the block which )rojects beneath the dove-tailed edges of the lugsS is likely to become broken, thus releasing the block. it-h the bars 9 and t curved 1n the form shown, it. will be seen that the face plat s cannot be removed from the cementitious ody of the blocks without actually forcing the ends of the'bars toward each other; and, as this movement of the ends of the bars would necessitate the 2 plication of a force sutlicient to compress the concrete, it will be seen that it is impossible to remove the face plates without actually destroying the same. The anchor bars thus serve not only to securely attach the face plates to the body of the block, but they also serve to reinforce the block itself by extending therethrough, and they further serve to equalize the temperatures between the face plates and the block at the rear thereof. .\s will be understood. the face plates are exposed in the building, and the heat of the sun or the chilliness of the air will heat or chill the face plates to a greater degree than the body of the block which is protected 55 chorage in the block, the ribs are preferal'ily thereby. The face plates and the h ock will,

' therefore, expand and contract differently, and it is desirable to minimize this difference to the greatest possible extent. The ends of j extending into the face the anchor bars,

plates'adjacent their exposed faces, will have substantially the same temperature of the face plates and this temperature will be conducted by the bars into the mass of the concrete at the rear of the face plates, and thus 1 +listfibute the heat orthe cold of the face face plates in position.

plates through the block adjacent the anchor )ars.

The outer and inner edges of the face plates and 4 are preferably provided with a groove or rabbet 13 extending entirely about the same. In formin the block, the face plates are laid upon a Tat surface, and a sheet of Waterproof material 14 is laid over the blocks, the said sheet being perforated at l5 and- 15 so as to permit the rear faces of the plates to project through the sheet, the sheet lying within the rabbeted grooves 13 of the blocks. as shown in Fl x thiis' cut away, leaving the same -as a sort ofgrid, the bars of which extend between the plates and close the bottoms of the spaces thercbetween. This waterproof sheet and the face plates therefore serve not only to completely Waterproof the exposed face of the block, in the rear part of the block from combining chemically with the elements in the clay of the face plates. which combination would probably result in the formation of a white coat on .the face-plates, as is common in brick Work, but the sheet serves. as a pattern for spacing the face plates. As this sheet may be perforated according to any desired pattern or system, and the arrange ment of the face plates will conform to this system of perforations, it will be seen that any desired arrangement of face plates is easily and accurately secured. The waterproof sheet being thus placed in proper position with respect to the face plates, and the anchor bars 9 and 9 being in place, the cementitious material forming the body of the block is deposited on the plates and is tamped or pressed into position, as is customary in the formation of building blocks, the anchor bars thus becoming firmly embedded in the block, securely holding the In order to secure still further anchorage, the rear face of the sheet 14 is preferably sanded, as indicated in Fig. 2 by the stipple work thereon. \Vhile, as stated, the sheet 14 may be formed of any suitable material, it is my preference at present to form the same of paper similar to tarred roofing paper, such material having the desired water-proofing characteristie, and also having the further characteristic of somewhat softening under the heat of the sun when the blocks are exposed thereto The greater part of the sheet is and to prevent the elen'lents' l j i l l l l i l i l t i i in the building; This softening qualityof the paper causes the same to st-illfurther adhere to the face lates and to the block and to thus close allpores therein so as to render the entranceo moisture impossible. The face plates may be spaced apart any desired distance, or their adjacent edges may, actually abut, the stripsbetween the perforations in the sheet 14 being correspond ingly narrow and resting, as described, in the ooves or rabbets 13. t x

As s 10Wl1 particularly'in l igs. 2 and 4, the sheet 14 projects from the body of the block a slight distance. whichfdistance is equal to half of the width of the mortar joint between two adjacent blocks after they are assembled. In asscmblin the blocks, therefore, the same are pla'ced with the edges of the sheets 14 therein'abutting, said abutting edges, owing to the softening tendency in the material of the sheet hereinbe-t'ore referred to, tending to adhere together, thus forming a practically continuous waterproof sheet at the joints of the blocks; t

In the drawings, I have elected to show the outer sides and ends of the face plates tapering or dove-tailed, in which case a dove-tailed space or joint 16 is formed between the face plates, which space may be filled with waterproof cement, as indicated in the drawings. This cement is preferably applied after the blocks are set up in the building. in which case it is impossible to distinguish one block from another, the joints between the blocks being substantially of the same width as the joints between the l face plates, so that, assuming the face plates are made to represent bricks, a well thus formed has the identical appearance of a brick wall. In some cases, however, it is desirable to leave the joints open or to have what is termed a raked-out joint. \Vhen such a joint is desired, 1 preferto form the edges of the plates square so as to leave a rectangular channel forthe joints. This sort of joint is therefore left open in the building; and the sheet 14 appears at the. bottom thereof. This sheet may, in such cases, be colored as desired so as to simulate ditt'erel'it colors of mortar, which colors may be painted or otherwise placed on the said sheet either before or after the blocks are formed, or after the blocksareassembled in the building.

As a further-advantage of my invention, I may mention the fact that,in the building of brick walls. it is necessary to attach the front face of the wall.-which is usually of br|ek,-to the rear formed of one kind body of the same wall, which rearbody is usually formed of an inferior quality of brick. These portions of the wall are -usually attached together by the mortar used in the wall, and also by employing whole bricks for headers, which bricks extend rearwardly into the back portions of the wall. In in construction, the front face of the wall is ormed of the face plates which are securely embedded in the cementitious material of the block, and no inwardly extending headers are required. In Fig. 6, I have shown av separated by the partition 3, and-it is also v or locking rovided with the-face grooves 7 a for keying the blocks together. On the faces of this b ock that are to be exposed'I em: ploy face plates 4 the same being identical in construction with the face plates 4. and :1, except that in Fig.6 I have shown theface plates arranged according to the i-Xmcrican bond system so that the face plates become substantially of the same dimensions. I have elected to show this bonding system in this fi ure merel for the )urpose of illustil I l seen that one side or leg of the block is of substantially twice the length of the other, the long leg of one face plate alternating with the shorter leg in the next adjacent course of face plates on the block, as shown in Fig. 6. On the rear faces of theplates l, 1 form the groove or rabbet 13 for receiving the waterproof sheet. These corner blocks are also provided with the dovetailed ribs 8. the same corresponding in construction with the ribs 8 hereiubefore described. The metallic anchor bars are preferably placed diagonally across the corners so as to project into the cementitious material of the block at the rear of the corners. As shown inFig. 7 the longer leg of the face plate is provided with a pair of ribs 8, While the shorter leg has but a single one of such ribs, and the anchor bar 9 is extended from the outer rib of the longer leg to the rib on the shorter leg. This construction is preferred for the reason that a longer bar may be emiloyed, which can secure a firmer anchorage n the cement than would be the case if a short bar were used between the lug on the shorter leg and the adjacent lug on the longer leg of the plate.

In Fig. 8 I have shown a modified construction for the corner of a block, in which block for use on the corners of buildings, on porch col umns, chimneys, or any other place aboutv a building where it becomes necessary to carry a wall about a corner. This block.

preferably has the air spaces 2*,{ which are ribs 8 of the same construction as the ribs- 8 and 8*, hereinbefore,, .described, and also 1 the 'rabbcted groovearound the ,outer edge of the rear side of the face f plates for the waterproof sheet 14%,: said gslieet 1 closing the .inner part o'fjthelfjoint between theuface plates. 4, In o'rder tojhidejthe joint between the face plates at .the corner; of the block," I employ a waterproof curved plate or molding 4," the edges of 'whichv rest against the outer faces of the face plates near their adjacent xends,lthec urved plate forming what may be termed a waterproof molding covering the corner of the block. This molding is shown in perspective in Fig. 9, from. Which it may be seen that the ends of the moldin are partially closed by projections 4, said their adjacent faces depressions l into which extend the ends of an anchor bar 9. This anchor bar extends rearwardly through the joint between the face plates 49 into the cementitious material of the block at the rear of the face plates, thus firmly anchoring the molding r to the main body of the block and holding the same securely against the outer faces of the face plates. In order to retain the ends of the anchor bar 4 in the recesses 4, the interior space P of the molding is filled with cementitious material, the same being preferably waterproof cement, said material also extending into and filling the joint between the face plates at the corner of the block.

A building constructed of blocks made in accordance with Fig. 8 presents a unique and attractive appearance owing to the molding which protects and conceals the more or less ragged and unsightly corners'of the build- While I have shown the embodiment of my invention as at present I prefer to use the same, I desire it to be understood that the following claims are not intended to be limited to the details of construction shown, any further than is rendered necessary by the specific terms therein employed.

I claim:

1. A building block for exterior Wall construction, said block having a main body portion formed of cementitious material and adapted to support the weight of the superadded structure, a plurality of water proof face plates attached to one of the faces of the block that is exposed in the wall, metallic anchors engaging the face plates and embedding in the body portion of the Wall, and a layer of water proof material separating the cementitious material from the face plates at the rear edges of the latter to prevent the entrance of moisture into the body projections having on of the block, the metallic anchors holding thefaee plates to the block.

2. In a building block for exterior wall construction, the combination with the main body portion of the block, said body portion being formed of cementitious material, of a plurality of face plates formed of water proof material, means for attaching the face plates to the cementitious material of the body of the block, and a sheet of water proof material surrounding the rear edges of the face plates for preventing the entrance of moisture about the plates.

3. In a buildin block, the combination with a face plate formed of waterproof material, of cementitious material forming the body of the block, means for attaching the face plate to the cementitious material, and a sheet of Waterproof material surrounding the rear edges of the face plate for prevpnting the entrance of moisture about the p ate.

1. In a building block, a perforated sheet of waterproof material, the perforations in which sheet are arranged according to a prearranged order, a plurality of face plates of waterproof material having their rear sides projecting through the said perforations in the sheet, ccmentitious material forming the body of the block at the rear of the face plates and at the rear of the said sheet, and means for attaching the face plates to said cementitious material, whereby the face plates and the said sheet form a continuous waterproof face for the block.

5. In a building block, a perforated sheet of waterproof material, the perfo'ations in which are arran ed in definite order, a plurality of face p ates, one for each perforation in the sheet and having their rear faces extending into the said perforations, the portions of the sheet between the perforations ridging across the spaces between the face plates, cementitious material at the rear of the face plates and at the rear of the said sheet, and means for anchoring the face plates to the cementitious material, the construction being such that the face plates and the perforated sheet form a complete waterproof face for the block.

6. In a building block, the combination with a face plate of waterproof material, an anchor bar having its ends attached to the rear side of the face plate, and cementitious material forming the body of the block and embedding the said anchor bar therein, whereby the face plate is securely anchored to the body of the block.

7. In a building block, a face plate having lugs 011 its rear side, the adjacent faces of the lugs overhanging the plate at the bases of the lugs, an anchor bar having its ends en 'aging beneath the overhanging portions of the said lu s, and cementitious material at the rear of the-face plate and embedding the anchor bar, whereby the face plate is securely attached to the body of the block.

8. In a building block, a face plate formed of waterproof material, said plate havin lugs on its rear face, the adjacent faces 0 the lugs being inclined from the body of the plate toward each other so thatthe outer parts of the lugs overhang the rear face of the plate, a bowed metal bar having its ends projected beneath the overhanging sides of the lugs and spanning the space between the lugs, and cementitious material forming the body of the block and embedding the metal'bar therein, whereby the face plate is securely anchored to the body of the block.

9. In a concrete block, a face plate having upon its rear face a pair of projections, the adjacent faces of said projections inclining toward each other and overhanging the rear face of the plate, a metal bar having its ends flattened and bowing outwardly over the face plate between the said lugs, and cementitious material forming the body of the block and embedding the said bar and the projections, whereby the face plate is securely anchored to the body of the block.

10. In a building block, a face plate having on its rear side a pair of projections, the adjacent faces of said projections being inclined toward each other and overhanging the rear of the plate at the base of the projections, said plates also having recesses at the base of the said projections, a bowed anchor bar having its ends projecting into the said recesses and under the overhanging faces of the projections, and cementitlous material deposited upon said plate and embedding the said lugs and bar, whereby the face plate is securely anchored to the body of the block.

11.. In a building block, the combination with a perforated sheet of waterproof material, of a )luralit-y of face plates having their rear aces extending into the perforations of the said sheet, metallic anchor bars secured at their ends to the rear faces of the said plates, and cementitious material forming the body of the block and covering the rear faces of the face plates and the waterproof material, said cementit'ious material embedding the anchor bars and securely attaching the face plates and the Waterproof sheet to the block.

12. In a building block, a. sheet of waterproof material having rectangularly shaped perforations therein arranged in order, a waterproof face plate for each of the perforations in the sheet, each block having its rear face extending into a corresponding perforation in the sheet, and each block having a pair of lugs on its rear face projecting beyond the rear side of the sheet, the adjacent faces of the lugs inclining toward each other so as to overhang the face plate at the base of the projections a bowed anchor bar rear faces of the plates an sheet an embedding the said projections and anchor bars,

whereby the face plates and the sheet are securely anchored to the body of the block and form a waterproof face therefor.

13. In a building block, a sheet of waterproof material having rectangularly sha ed perforations therein, a plurality of ace plates having their rear faces extending into the said openings, the portions of the sheet between the openings corresponding to the joints between the face ilates and closing said joints at the rear, said sheet )rojecting beyond the block so as to abut witi a correspondin rojecting sheet in the next adjacent lfiOtK, cen'ientitious material forming the body of the block deposited upon the rear of the face plates and upon the sheet, and means for securely anchoring the face plates to the said cementitious material.

14. In a building block, a sheet of waterproof material, said sheet having rectan- 'ular openings formed therein and arranged in definite order, a face plate of waterproof material for each of said openings, each of said face plates having a groove or rabbet formed about the edge of its rear face, that part of the face plate within the said groove or rabbet. fitting a corresponding opening in the waterproof sheet, the face plates being projected through said sheet with the latter tting in the grooves or rabbe'ts, rejections on the rear faces of each of said ace plates, bowed metallic anchor bars engaging at their ends with the said projections and extending outwardly at their centers from the rear faces of the plates, and cementitious material deposited upon the rear faces of the face plates and upon the water proof sheet, said material embedding the said lugs and anchor bars and securely attachin the face plates and the sheet to the body of the block.

15. A building block having attached to one of its faces. a plurality of spaced face plates of water proof material, cementitious material forming the body of the block to which the plates are attached, water proof material differing from the cementitious material at the rear of the edges of the face plates for preventing the entrance of moisture into the block, the spaces between the face plates bein open whereby raked out joints are provi ed.

16. A buildin block for exterior wall construction, sai block having a main body portion formed of cementitious material and adapted to support the weight of the superadded structure, a plurality of water proof face lates attached to one of the faces of the b ock that is exposed in the wall, lugs on the rear faces of said face plates and metallic anchor bars enga 'ng at their ends with said lugs and exten mg inwardly there from and embedding in the cementitious material of the body of the block, the spaces between the face plates being left 0 en whereby raked out joints areprovided etween the face lates.

17. In a bui ding block, a waterproof face plates arrange order and spaced at their edges so as to form joints between the lates, anchor bars attached to the rear aces of said plates and bowing outwardly therefrom, water roof paper resting upon the rear faces 0 the plates at their edges and spanning the spaces between the plates, and cementitious mate-. rial deposited upon the rear of the plates and the paper and embedding the anchor bars therein.

18. In a building block, a perforated sheet of water proof material having its rear face plurality of in definite sanded, tie perforations in which sheet are a plurality of face plates of water proof material having their rear sides projecting through the said perforation in the sheet, ccmcntitious material forming the body of the block at the rear of the face plates and at the rear of the said sheet, said material adhering to the sanded face of the said sheet, and means for attaching the face plates to said cementitious material, whereby the face plates and the said sheet form a continuous water proof face for the block.

19. 111 a building block, a perforated sheet of water proof material having its rear face sanded, the perforations in which sheet are arranged in definite order, a plurality of face plates, one for each perforation in the sheet and having their rear faces extending into the said perforations, the portions of the sheet between the perforations bridging across the spaces between the face plates, cemcntitious material at the rear of the face plates and at the rear of the said sheet, the said material. adhering to the sanded surface of the sheet, and means for anchoring the face plates to the cementitious material, the perforated sheet preventing the entrance of the cen'ientitious material between the edges of the face plates and thus providing open spaces between the face plates,

entitious material forming the body ofthe block to which the plates are attached, and nieans for prewnting the tltllltlli'lilOllS material from entering between the plates, whereby an open or raked-out joint: is provided.

22. In a building block, the combination of a plurality of spaced face plates having projections on their rear faces, said face plates being formed of water n'oof' material and having their rear edges beveled, cementitious material forn'iing the body of the block and embedding the said projections on the face plates for attaching the latter to the block, and a waterproof sheet for preventing the entrance material between the face plates, whereby an open or raked-out. dove-t provided betweenthe plates.

23. In a building block, a perforated sheet of waterproof material, the perforations in which sheet; are arranged in definite order, a plurality of face plates of waterproof material, having their rear edges beveled and having their rear sides projecting through the said perforations in the-sheet, cementitious material forming the body of the block at the rear of the face plates and at the rear of the said sheet, and means for fastening of the cementitious' 4 embeddin whereby the face plates and theperforated ailed space is the face plates to .sirid cetnentitious material, 5

whereby the face plates and the cemenlitious material form for the block, and thesald sheet prevents the COH'lOlliJtlOllS materlal from entering the viding open dove-tailed spaces face plates.

. 24. Ina building block, the combination bet ween the a complete waterproof face 1 thus pro with a perforated sheet of water proof material, of a plurality of face pluteshaving their rear faces extending into the perforations of the said. sheet, projections on the rear sides of the face plates, the adjacent faces of said projections on each block being inclined toward each other and overhanging the rear of the plates at the bases of the rojections, a bowed anchor bar for each ace plate, said bar ha ring its ends projecting under the overhanging faces of the projections on the plate, and cementitious material forming the body the said lugs and anchor bars,

sheet are securely the block.

25. A building block having attached to one of its faces a plurality of spaced face plates of water proof material, cementitious material forming the body of the block to which the plates are attached, and water proof material differing from the ccmentitious material between the edges of the face plates for preventing the entrance of moisture into the block.

26. A building block having attaehed to one of its faces a plurality of spaced face plates of water proof material, said plates beingarranged according to a definite. order. cen'lentitious material forming the body of the block to which the plates are attached, and water proof material differing from the cententitious material between the face anchored to the body of plates for preventing the entrance of moissignature in the presence of two witnesses. SHERBURNE H. WTGH'IMAN.

W i tnesses S. E. Focus, A. J. HUDSON.

of the block and 

